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/*
* Copyright (C) 2015-2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SetupVarargsFrame.h"
#if ENABLE(JIT)
#include "Interpreter.h"
#include "JSCJSValueInlines.h"
#include "StackAlignment.h"
namespace JSC {
void emitSetVarargsFrame(CCallHelpers& jit, GPRReg lengthGPR, bool lengthIncludesThis, GPRReg numUsedSlotsGPR, GPRReg resultGPR)
{
jit.move(numUsedSlotsGPR, resultGPR);
// We really want to make sure the size of the new call frame is a multiple of
// stackAlignmentRegisters(), however it is easier to accomplish this by
// rounding numUsedSlotsGPR to the next multiple of stackAlignmentRegisters().
// Together with the rounding below, we will assure that the new call frame is
// located on a stackAlignmentRegisters() boundary and a multiple of
// stackAlignmentRegisters() in size.
jit.addPtr(CCallHelpers::TrustedImm32(stackAlignmentRegisters() - 1), resultGPR);
jit.andPtr(CCallHelpers::TrustedImm32(~(stackAlignmentRegisters() - 1)), resultGPR);
jit.addPtr(lengthGPR, resultGPR);
jit.addPtr(CCallHelpers::TrustedImm32(CallFrame::headerSizeInRegisters + (lengthIncludesThis ? 0 : 1)), resultGPR);
// resultGPR now has the required frame size in Register units
// Round resultGPR to next multiple of stackAlignmentRegisters()
jit.addPtr(CCallHelpers::TrustedImm32(stackAlignmentRegisters() - 1), resultGPR);
jit.andPtr(CCallHelpers::TrustedImm32(~(stackAlignmentRegisters() - 1)), resultGPR);
// Now resultGPR has the right stack frame offset in Register units.
jit.negPtr(resultGPR);
jit.getEffectiveAddress(CCallHelpers::BaseIndex(GPRInfo::callFrameRegister, resultGPR, CCallHelpers::TimesEight), resultGPR);
}
static void emitSetupVarargsFrameFastCase(VM& vm, CCallHelpers& jit, GPRReg numUsedSlotsGPR, GPRReg scratchGPR1, GPRReg scratchGPR2, GPRReg scratchGPR3, ValueRecovery argCountRecovery, VirtualRegister firstArgumentReg, unsigned firstVarArgOffset, CCallHelpers::JumpList& slowCase)
{
CCallHelpers::JumpList end;
if (argCountRecovery.isConstant()) {
// FIXME: We could constant-fold a lot of the computation below in this case.
// https://bugs.webkit.org/show_bug.cgi?id=141486
jit.move(CCallHelpers::TrustedImm32(argCountRecovery.constant().asInt32()), scratchGPR1);
} else
jit.load32(CCallHelpers::payloadFor(argCountRecovery.virtualRegister()), scratchGPR1);
if (firstVarArgOffset) {
CCallHelpers::Jump sufficientArguments = jit.branch32(CCallHelpers::GreaterThan, scratchGPR1, CCallHelpers::TrustedImm32(firstVarArgOffset + 1));
jit.move(CCallHelpers::TrustedImm32(1), scratchGPR1);
CCallHelpers::Jump endVarArgs = jit.jump();
sufficientArguments.link(&jit);
jit.sub32(CCallHelpers::TrustedImm32(firstVarArgOffset), scratchGPR1);
endVarArgs.link(&jit);
}
slowCase.append(jit.branch32(CCallHelpers::Above, scratchGPR1, CCallHelpers::TrustedImm32(JSC::maxArguments + 1)));
emitSetVarargsFrame(jit, scratchGPR1, true, numUsedSlotsGPR, scratchGPR2);
#if !CPU(ADDRESS64)
slowCase.append(jit.branchPtr(CCallHelpers::Above, scratchGPR2, GPRInfo::callFrameRegister));
#endif
slowCase.append(jit.branchPtr(CCallHelpers::GreaterThan, CCallHelpers::AbsoluteAddress(vm.addressOfSoftStackLimit()), scratchGPR2));
// Before touching stack values, we should update the stack pointer to protect them from signal stack.
jit.addPtr(CCallHelpers::TrustedImm32(sizeof(CallerFrameAndPC)), scratchGPR2, CCallHelpers::stackPointerRegister);
// Initialize ArgumentCount.
jit.store32(scratchGPR1, CCallHelpers::Address(scratchGPR2, CallFrameSlot::argumentCountIncludingThis * static_cast<int>(sizeof(Register)) + PayloadOffset));
// Copy arguments.
jit.signExtend32ToPtr(scratchGPR1, scratchGPR1);
CCallHelpers::Jump done = jit.branchSubPtr(CCallHelpers::Zero, CCallHelpers::TrustedImm32(1), scratchGPR1);
// scratchGPR1: argumentCount
CCallHelpers::Label copyLoop = jit.label();
int argOffset = (firstArgumentReg.offset() - 1 + firstVarArgOffset) * static_cast<int>(sizeof(Register));
#if USE(JSVALUE64)
jit.load64(CCallHelpers::BaseIndex(GPRInfo::callFrameRegister, scratchGPR1, CCallHelpers::TimesEight, argOffset), scratchGPR3);
jit.store64(scratchGPR3, CCallHelpers::BaseIndex(scratchGPR2, scratchGPR1, CCallHelpers::TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
#else // USE(JSVALUE64), so this begins the 32-bit case
jit.load32(CCallHelpers::BaseIndex(GPRInfo::callFrameRegister, scratchGPR1, CCallHelpers::TimesEight, argOffset + TagOffset), scratchGPR3);
jit.store32(scratchGPR3, CCallHelpers::BaseIndex(scratchGPR2, scratchGPR1, CCallHelpers::TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)) + TagOffset));
jit.load32(CCallHelpers::BaseIndex(GPRInfo::callFrameRegister, scratchGPR1, CCallHelpers::TimesEight, argOffset + PayloadOffset), scratchGPR3);
jit.store32(scratchGPR3, CCallHelpers::BaseIndex(scratchGPR2, scratchGPR1, CCallHelpers::TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)) + PayloadOffset));
#endif // USE(JSVALUE64), end of 32-bit case
jit.branchSubPtr(CCallHelpers::NonZero, CCallHelpers::TrustedImm32(1), scratchGPR1).linkTo(copyLoop, &jit);
done.link(&jit);
}
void emitSetupVarargsFrameFastCase(VM& vm, CCallHelpers& jit, GPRReg numUsedSlotsGPR, GPRReg scratchGPR1, GPRReg scratchGPR2, GPRReg scratchGPR3, InlineCallFrame* inlineCallFrame, unsigned firstVarArgOffset, CCallHelpers::JumpList& slowCase)
{
ValueRecovery argumentCountRecovery;
VirtualRegister firstArgumentReg;
if (inlineCallFrame) {
if (inlineCallFrame->isVarargs()) {
argumentCountRecovery = ValueRecovery::displacedInJSStack(
inlineCallFrame->argumentCountRegister, DataFormatInt32);
} else {
argumentCountRecovery = ValueRecovery::constant(jsNumber(inlineCallFrame->argumentCountIncludingThis));
}
if (inlineCallFrame->m_argumentsWithFixup.size() > 1)
firstArgumentReg = inlineCallFrame->m_argumentsWithFixup[1].virtualRegister();
else
firstArgumentReg = VirtualRegister(0);
} else {
argumentCountRecovery = ValueRecovery::displacedInJSStack(
CallFrameSlot::argumentCountIncludingThis, DataFormatInt32);
firstArgumentReg = VirtualRegister(CallFrame::argumentOffset(0));
}
emitSetupVarargsFrameFastCase(vm, jit, numUsedSlotsGPR, scratchGPR1, scratchGPR2, scratchGPR3, argumentCountRecovery, firstArgumentReg, firstVarArgOffset, slowCase);
}
} // namespace JSC
#endif // ENABLE(JIT)
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